Electrostatic Conveyer for Excitons

Authors :: Winbow, A. G.
Leonard, J. R.
Remeika, M.
Kuznetsova, Y. Y.
High, A. A.
Hammack, A. T.
Butov, L. V.
Wilkes, J.
Guenther, A. A.
Ivanov, A. L.
Hanson, M.
Gossard, A. C.
Source :: Phys. Rev. Lett. 106, 196806 (2011)
Publication Year :: 2011
Abstract: We report on the study of indirect excitons in moving lattices - conveyers created by a set of AC voltages applied to the electrodes on the sample surface. The wavelength of this moving lattice is set by the electrode periodicity, the amplitude is controlled by the applied voltage, and the velocity is controlled by the AC frequency. We observed the dynamical localization-delocalization transition for excitons in the conveyers and measured its dependence on the exciton density and conveyer amplitude and velocity. We considered a model for exciton transport via conveyers. The theoretical simulations are in agreement with the experimental data.<br />Comment: 4 pages, 4 figures + supplemental material including two videos